Sample Detail of
Sample: Sample No. 92AD33-120 -- USGS No. 32437-PC
Locality: Field No. 92AD33-120
Description: Howard Pass C-3. Measured section extends from 68o 30'40"/157o 31'00" (top) to 68o 30'32"/157o 31'34" (base). Sample from 50-cm-thick bed of fetid dolostone containing relict crinoids and solid hydrocarbons in vugs. Thin section is dolomite crystal mosaic that contains rare relict crinoid ossicles. Collected 120 m below top of measured section. Heavy-mineral concentrate is chiefly fluorite. (description from Dover et al., 2004, p. 42 (Table 1));
Howard Pass C-3. 68°30'37", 157°31'20". 50-cm thick bed of fetid dolostone with relict crinoids and hydrocarbons in vugs. Collected from 120.2 m below top of measured section.
92AD32, 33, 49A, 47 from platformal facies of Lisburne Group at Mt. Bupto, ~1-2 miles east of headwaters of Bushy Creek and ~4 miles southwest of Rim Butte along west side of eastern half of Mount Bupto, western Brooks Range. 92AD32A collected from "Black Lisburne" facies, overlying (structurally and stratigraphically(?) rest of the samples (92AD33, 49, 47). Age of similar rocks at Ivotuk Hills is Chesterian (85ASi14-18).

92AD33-0.2 to -120 from 1240 m and 1100 m elevation of continuously exposed chert and dolostone along trend with measured section of Gus Armstong (<0.25 mile due north), who suggested an age of Meramecian (based on silicified colonial corals and forams) for the upper 100 m (at least) of section (see Armstrong, AAPG Bulletin, v. 54, p. 251+, 1970); N part NE1/4 sec. 9, T. 11 S., R. 24 W, lat. 68°30'43" to 68°30'37", long. 157°31'00" to 20", Howard Pass C-3 quadrangle. (description from Harris E&R report dated March 17, 1995)]
Location: Alaska Quadrangle: Howard Pass C-3
Lat.: 68o30'32 " Long.: 157o31'34 "
Reference
Title: Geologic and fossil locality maps of the west-central part of the Howard Pass Quadangle and part of the adjacent Misheguk Mountains Quadrangle, western Brooks Range, Alaska ,  2004
Report by: Jim Dover , Irv L. Tailleur , Julie A. Dumoulin
Age: Early Mississippian (Early Mississippian, probably Osagean)
Formation: Lisburne Group (Bupto facies of Lisburne Group (Upper and Lower Mississippian))
CAI:Min: 1.5
Comment:Age: Early Mississippian, probably Osagean.

Biofacies: Indeterminate (too few conodonts)

Shown as locality 71 on Sheet 2; map unit: Mlb

CAI=1.5

Processed 6.8 kg of rock.

Occurrence(s)
No. Group Name Qty Notes
1 Conodonts 3 incomplete Pa elements Polygnathus communis communis Branson and Mehl All conodonts identified by A.G. Harris
2 Conodonts 4 Sb-Sc element fragments Kladognathus sp. indet.
3 Conodonts 4 indet. bar, blade, and platform fragments

Title: Report on Referred Fossils ,  1995 (03/17)
Analysis of all samples is given in the accompanying 16-page table. The range of biostratigraphically important samples is shown on the accompanying diagram. The heavy-mineral concentrates were analyzed by Nancy Stamm; the residues have been returned to Julie Dumoulin. Please note a few (~4 samples have heavy-mineral concentrates that include chalcopyrite and bornite).
Report by: Anita G. Harris
Referred by: Julie A. Dumoulin , J. H. Dover
Age: Osagean (Early Mississippian, probably Osagean)
Formation: Lisburne Group
CAI:Min: 1.5
Comment:Age: Early Mississippian, probably Osagean.
Biofacies: Indeterminate (too few conodonts)
CAI = 1.5

6.8 kg of rock processed (220 g +20 mesh and 366 g 20-100 mesh insoluble residue).
Heavy-mineral concentrate (+100 mesh): chiefly fluorite euhedra, dolomite and minor iron oxides.

Occurrence(s)
No. Group Name Qty Notes
1 Conodonts 3 incomplete Pa elements Polygnathus communis communis Branson and Mehl
2 Conodonts 2 Sb-Sc element fragments Kladognathus sp. indet.
3 Conodonts 4 indet. bar, blade, and platform fragments